Year % of relevant age group 1971 106.05732 1972 118.85957 1973 115.81092 1974 109.83774 1975 102.3758 1976 107.31318 1977 104.33698 1978 101.1259 1979 106.17319 1980 106.43738 1981 105.44361 1983 108.45298